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Acta Agron Sin ›› 2015, Vol. 41 ›› Issue (03): 349-358.doi: 10.3724/SP.J.1006.2015.00349

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS •     Next Articles

Mapping Quantitative Trait Loci Related to Spike Traits Using a RILs Population of Yanda 1817 × Beinong 6 in Wheat (Triticum aestivum L.)

WU Qiu-Hong1,**,CHEN Jiao-Jiao1,**,CHEN Yong-Xing1,ZHOU Sheng-Hui1,FU Lin1,ZHANG De-Yun1,XIAO Yao1,WANG Guo-Xin1,WANG Zhen-Zhong1, WANG Li-Xin2,HAN Jun3,YUAN Cheng-Guo4,YOU Ming-Shan1,LIU Zhi-Yong1,*   

  1. 1 Department of Plant Genetics & Breeding, China Agricultural University, Beijing 100193, China; 2 Beijing Academy of Agriculture and Forestry Sciences, Beijing 100197, China; 3 Beijing University of Agriculture, Beijing 102206, China; 4 Gaoyi Stock Seed Farm, Gaoyi 051330, Hebei, China
  • Received:2014-09-09 Revised:2014-12-19 Online:2015-03-12 Published:2014-12-19
  • Contact: 刘志勇, E-mail: zhiyongliu@cau.edu.cn E-mail:hongfeng8783@126.com

Abstract:

 Spike length (SL), grain number per spike (GNS), and grain weight per spike (GWS) are important spike traits associated with yield in wheat. In this study, quantitative trait loci (QTLs) for spike traits were mapped using an available high-density SNP and SSR genetic linkage map developed from a recombinant inbred line (RIL) population of Yanda 1817 × Beinong 6. Using phenotypic data on two locations (Beijing and Shijiazhuang) in two years (2011–2012 and 2012–2013 growing seasons), 29 QTLs for SL, GNS and GWS were detected by inclusive composite interval mapping (ICIM) (LOD ≥ 2.5). Among which, 10 QTLs for spike length were mapped on chromosomes 1B, 2D, 3A, 3B, 4A, 5A, 5B, 6A, and 7D with phenotypic variations ranging from 2.96% to 9.63%. A stable and major QTL associated with SL, QSl.cau-4A.2, was detected in all the environments with phenotypic variations ranging from 5.89% to 9.62%. Eight QTLs for GNS were found on chromosomes 1A, 3A, 3D, 4A, and 5B with phenotypic variations from 4.06% to 11.17%. However, they were all environments sensitive and detected in a single environment. Eleven QTLs for GWS were mapped on chromosomes 1A, 1B, 2A, 2D, 3A, 4D, 5A, 5B, and 6B with phenotypic variations ranging from 2.79% to 16.12%. The QTL QGws.cau-6B.2 was identified in three environments and the favorable allele was contributed by Beinong 6. The stable QTLs on chromosomes 3A, 4A, 6B, and 7D identified in this study may serve as target sites in marker-assisted selection of spike related traits in wheat breeding program.

Key words: Wheat, RILs, Spike trait, QTL

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